Inverted gas-burner.



PATENTED OCT. 22-. 1907.

T. F. KENT, INVERTED GAS BURNER. APPLICATION FILED MAR. 10, 1906.

2 SHEETS-SHEET 1.

INVENTOR WITNESSES.- fi Q-M'Jf ATTORNEY was noRRrs Planes 50-, WAsnlNa'mN, a c.

PATENTED OUT. 22. 907.

T. I. KENT. INVERTED GAS BURNER.

APPLIQATION FILED MAR. 10, 1906.

2 SHEETS-SHEET 2.

WITNESSES.-

' 6 W Q9, W

111: NORRIS s-ra s 00-, WASHIN THOMAS F. KENT, OF NEWARK, NEW JERSEY.

INVERTED GAS-BURNER.

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed March 10,1906- Serial N0. 305,243.

To all whom it may concern:

Be it known that I, Tnorms F. IIENT, a citizen of the United States, residing at Newark, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Inverted Gas-Burners, of which the following is a specification.

This invention relates to that class of incandescent gas burners used for illuminating purposes which are known as inverted gas burners, and in which the flame and mantle therefor are directed downwardly.

The objects of the invention are to secure perfect combustion in such a burner and avoid carbonizing, whereby an accumulation of soot gathers in and above the mantle to thus avoid the danger of fire which results from said accumulated soot getting red-hot and dropping downward from the gas jet; to avoid the wellknown difficulty of back-flashing; to secure a brilliant light together with economy of gas consumption; to obtain a secure fastening of the mantle and globe upon the gas jet; to provide a simple and inexpensive construction, and to secure other advantages and results as may be brought out in the following description.

The invention consists in the improved inverted gas burner, substantially as hereinafter described and claimed.

Referring to the accompanying drawings, in which like numerals of reference indicate corresponding parts in each of the several figures, Figure 1 is a side view of a gas fixture having a burner of my improved construction and being partly in vertical central section; Fig. 2 is a central section on line :0, Fig. 4, of the'Bunsen tube and entrance end of the mixing chamber, and Fig. 3 is a similar view of the discharge end of the mixing chamber; Fig. 4 is a cross-section taken on line y, Fig. 2; Fig. 5 is a similar cross-section taken on line 2, Fig. 3; Fig. 6 is a side elevation of the discharge end of the gas burner showing the support of the mantle ring thereon, and Fig. 7 is a similar view with the mantle ring removed.

- In said drawings, 1 indicates a 'gas supply pipe of any ordinary form provided with an elbow tube having a cock 3, and an upwardly directed end 4 to receive my improved burner. Said burner comprises first a gas check 5, adapted to screw onto said end 4, with an upper reduced and exterior-1y threaded portion 6, adapted to receive the Bunsen tube 7. Said Bunsen tube has at its lower part apertures 8, in its walls for the admission of air, and in the top of the gas check 5, is screwed a changeable nipple 9, formed with a small tapering outlet 10, the extremity of which is'in substantially the horizontal plane of the air openings 8, or adjacent thereto. The gas thus issuing in a forced jet immediately engages the air supply so that the two pass upward together on the familiar injector principle.

The upper part of the Bunsen tube 7, is of reduced diameter as at 11, the reduction being made abruptly at a little distance above the air-openings 8, and continued ofv the same diameter to the top of Bunsen tube. Said Bunsen tube is therefore at its opposite end-portions of different diameters, each portion being itself of uniform diameter and the two portions being separated by the abrupt annular shoulder. One end of an inverted 'U-shaped pipe 13, is then telescopically slipped over the reduced end 11, of the Bunsen tube, being held by a set screw 14, if necessary. This pipe forms the mixing chamber of my improved burner, and while I have shown it as U-shaped, any other form could be employed, as for instance a straight tube where the gas supplypipe entered through the ceiling of a room. The inside diameter of this tube 13, must be materially larger than the top opening of the Bunsen tube,in practice, I have found, about one-third larger. The length of the tube is such as will secure a complete mixture of the gas and air, and its inside diameter is preferably continued uniformly as just described. The other end of the said U-shaped pipe 13, is exteriorly threaded as at 15, and adapted to receive an exteriorly threaded end-piece 16, which end-piece is provided at its lower end with a discharge or ignition opening 17. This ignition opening 17, in order to secure a perfect operation of my invention, should be of the same crosssectional area as the upper part 11, of the Bunsen tube, and thus bearing the same relation to the mixing chamber 13, as has been set forth with respect to the top opening of the Bunsen tube. Furthermore, the transverse end-closure of said piece 16, is, like the walls of the end-piece, comparatively thin, and thus the delivery opening or perforation is of a length much less than its diameter: or, in other words, it is not a tube. Upon the outside of the said end-piece 16, are formed lugs 18, and which are adapted to receive and support the arms 19, of the ring or top 20, of the mantle 21. Preferably at least one of the said segmental lugs 18, is bent upward at its opposite ends 22, as shown in Fig. 6, where- 'by the mantle arms are prevented from becoming dislodged by jarring or the like.

Above the end-piece 16, is a ring nut 23, screwing upon the threaded end 15, of the mixing chamber 13, and which is adapted to clamp between itself and the end-piece 16, a globe-holder 25, of any approved construction. A globe 26 is then adapted to be supported in said holder and removably held as by a set-screw 27. Any other device commonly used upon lighting fixtures and capable of being supported in any well-known manner similar to the globe holder 25, could be employed without affecting the spirit and scope of my invention, and obviously such attachments can be conveniently changed by removing the end-piece 16, to suit different conditions or tastes.

In the operation of my improved burner, it will be understood that the gas issuing from the nipple 10, carries upward with it an air supply and the two become thoroughly mixed in the U-shaped chamber 13. mixture then issues from the aperture 17, under exactly the same pressure at which it entered the mixing chamber, since the openings at the two opposite ends thereof are exactly the same, and a perfect combustion is secured as the result. Furthermore such a combustion is secured regardless of varying pressures and qualities of gas, and this again is an important advantage of my improved construction.

It is highly essential, in an inverted burner particularly, that the operation be'not susceptible to slight lowerings of the gas pressure and liable to carbonization upon such lowerings, and this result I have obtained by my invention.

Having thus described my invention, what I claim as new is:

1. In an inverted gas burner, the combination of a Bunsen tube, gas supply means at the lower end of said Bun- This sen tube, a tubular mixing chamber receiving at one end the upper end of the Bunsen tube and having a bore of larger diameter than the opening of said upper end of the Bunsen tube, and a delivery end-piece at the other end of said tubular mixing chamber having an ignition opening whose cross-sectional area is the same as that of the opening of the upper end of the Bunsen tube.

2. In an inverted gas burner, a Bunsen tube having the upper part of its interior passage reduced and providing a tubular injecting portion of uniform diameter, gas supply means at the lower end of said Bunsen tube, a tubular mixing chamber receiving at one end the upper end oi the Bunsen tube and having a bore of larger diameter than said tubular injecting portion of the passage of the Bunsen tube, and a delivery end-piece at the other end of said tubular mixing chamber having an ignition opening equal in cross'sectional area to the said injecting portion of the passage of the Bunsen tube.

THOMAS F. KENT.

In the presence oi ItijssnLL M. Evnnn'r'r,

E'rIIEL B. Hum). 

